SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb7168d2d1f0885facbb07ed287fe37ea1f2eb7d41aa41a96776d92b93265896' 
  AND token = 'xTPhcsM7ghhwh6nIYCgRKAYyCqJv2vvXavugqcuRcAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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