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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f134cd05471e1a2a168d127f5d0a8c8ccfc6ae8499c506e0a9853a57b816755' 
  AND token = '1YvEIC5uI4TKh4kohuD2F8XryHtwr8hSPXIoaN6VXtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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