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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ef9e531416607cc224c517ac6bee3380a5102f8d48e2914c0a0a883b9a47bf1' 
  AND token = 'bvgzJj6Bd1d46zvyXXw1+dtB0zNTbU0/pyo9TRVjsA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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