SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5149aa34b9e451c72c7baf906db7861165f0d9979717c1023b13d719011781f4' 
  AND token = 'hnFvyBGMYhZxzO8rkVnTgmw0FlJ3y5uzGgczIQYZWrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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