Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99547b36e1f8ada15cd79ccbf26e2cd705589e3fa7c4411d7c4a2ae04b80d93c' 
  AND token = 'AGMem6twDYN9fdRHqjxHZyMal3GHkxG+FPN73mFK3Q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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