Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5033cbce1b969bb2d106098ed9f7e436b1c1dca4931e7d39eb2dc082844ac91' 
  AND token = 'tJ3sFOsknVB0hRCahd1sNkmWy+87AKsYgCaBCXUQIUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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