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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35ac4f97abaaf4f350c6d6b2723663ebffb1075cd0db0df33973e3ba2002e79c' 
  AND token = 'DzXY5tgZ+lws+SD03Q25ndUkmaE2uTfhWMy5ERHesWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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