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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a742448d52ed209cab2eb850234160309a651cf5f44d8d1f3de4f89cc16082a6' 
  AND token = 'cfA7davKryE/CnohIXxHlKASCuTjRfDY8UldifA1YQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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