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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5b03e58efcb97bb21b275bd5652ed8146ca69709bff6435748a087cf5d032b4' 
  AND token = 'eP9XN7hBaS5qHOg1qQzfEH48y8ln3ufITh/CWTkRzuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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