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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c274485111e4ea4530d81e08365a5b54f5cd033aeeb0d9d0dca5ba6445a9cae7' 
  AND token = 'LQ3iZg+QafWZvx3F4tJ+ofisjDo2B/orjABWCXzCWos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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