SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a0fadd7325e357729fb404c99319a1742d097721cc54c82e2d0f7a8b39ec5a4' 
  AND token = 'BVE3JYZxgnIsu2J8BdELd/El4s+6U7dvnBKkfiYzjSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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