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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '264e217f39b72983c3963ce57edbfb4641cb85b6bcafd8a68477b1eb7c8aac15' 
  AND token = 'TiIu7CfRR9V7gus89dZ3OBMQrF42WhH5ZD7kn6Yvtbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00082

JSON explain

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