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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b85c037370aa32cd13dd5f5ad396ba0d123c3498f0410e917a982b8a3f7e5a3' 
  AND token = '6V+7xwmjPWsFNaxW7uDiqfLC8l6/CguNETy4Z1CUrQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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