Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35a98be18392d188b22f39603061d57b1a0bcb02f24cb7f99506aad902213406' 
  AND token = 'fOOqVo1/29BL+Z6xolFgZXeS3M16mwW6eLHuosWr1fY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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