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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e829da9c4c3bedd37dcbb4a7e08477c123c1d8f036da26ae34806603cca02776' 
  AND token = 'pGMlJiXvn0ayoQ2cCvaxluB3PF5b890kC0SJBiPl8Gs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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