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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dc9b13f4cb5ba706c3a551ee587460acd2037e9e3c30e46d7a2cefc21d4f551' 
  AND token = 'SmAVYLnnLRpfajNuP7W96Ba5QkvI+jPOAC7u5e2/24M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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