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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f007925b1a776e4ec1156b2831291e068b7e062e834a7f1e9aaa243f96e3ca4' 
  AND token = 'rLaoYjr1Zy4nW6btR9jqzHsc4qkdPjPRjRXlWY43+D0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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