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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17f899104f9c48cfaa3c286f5f2e6f53c51c3dc7690ccb12fcd8cb8ed281270f' 
  AND token = 'KAuPMz+D8UUMcpidbrHptExYVtKC5WD0dX4xN5XYFHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}