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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '313e00491c407dfff37c670942dfdf9472c5df43770071498e9c4a9c9f4f2eab' 
  AND token = '95tijligL8dfOcANPnVE1BtN3tX5emSe6zGICbDkFvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00090

JSON explain

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