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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93944953ac533d12bc9e5520744ed1dbd232fe3782bd87fcfb2351383ea0b9cf' 
  AND token = 'SSnL4yuJhQoNBxli4UJ1Gjj5rZ5iC5Saf4AqxRD4rf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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