SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2895363b886aab9e8fc81b3b9b840d47a966bd943d41f56b726d82c0913f4635' 
  AND token = 'YyewhXHsQ2lw73sBRJpFUorNjqSjeg2/H1iSS+As2BQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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