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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c4771ae0e61a6d3c36ed0611027e18447e9f510d87df6f8636f244bc30f94e2' 
  AND token = 'PbGTpevd9FtpoRiP5ImYT6brHuxHLDSHJEM9T1eMKWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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