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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15eb268de8827d756c26ec8a90a91d8ffd8ea98315b4665dec11b72443a48708' 
  AND token = 'bIQ719MGIGV0IyyJyBp2Mao/2gmAm3PUYMm7W3PmQc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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