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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c079d2dee6c984a566bd05923608dacca8e9a0f2c5d4afc32d6bac7b9cb3180b' 
  AND token = '+14F3Sldpia5YPKqnbSf48j2wgZo5v8u839AKc0es0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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