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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b5b529584ca148eff54bf97f43bf6b0fb8e31cbbc7c8d7ea8f7464cdfe8130d' 
  AND token = 'v0EWJsW1d3CfZXfvTInGiaz4zOZSHLQ9OCRt6lTzoQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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