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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21bc4b9b9af33d1aca7e48e4e2238a1896748da26809b2d9847eafd1837374bc' 
  AND token = 'GV4cfpZf+uFQiD9n2N5SUWzPKIZ9NdoGZ7YYo4zpM3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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