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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c4be908f26a2f1b750ceaa7e84d7bb030a2377dd57b96cb79aee03c8b3f8110' 
  AND token = 'efS/K8RbZfaNb2SQIjTmgLPxCfgDDmLWXDFDeBpQ/Yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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