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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85215563a0f4f8084e6af63ac412032f0d09c29d70e9976de1aea07d96539393' 
  AND token = 'TYwXKm1dKF6dWmWtFFO1feq8Wf1vK48k9atHMRjJE5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}