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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cba5cc7575a71c392be5751b348fec1e8eb91765cd4dc1217cafda97d49f09a8' 
  AND token = '1xuTZtJ9Uq/rdB6jgXvBw0NhFiQddKabJOpuX861abQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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