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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3418b32394821c70e0639c08589da0e171bc00dd7e942407e6ab2182355490fd' 
  AND token = 'NDsukB9cWWeEhxXGfCaN1j9Stg/Q1buC1hT93ideUnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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