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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17a0c105c2951549b80f8b585daaeb2fc1cfe360fc429fd8d6e71d29c43ae9d7' 
  AND token = 'dljn771+UkZi943xpKxe9i/mF/s6bAvpYgBj2LmgcRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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