Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e3bab90812b7539b82fb00d693ff752f4071f1ac7099d52eab49f07e1f6c80c' 
  AND token = 'qN99rxp8Q40/GHkIQGcradwCdIp40c6lgbeDpoeZElE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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