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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cc47d53766a096341535cb92b70dd7ac229de6fb5e6d8a80ff1594efad436f5' 
  AND token = 'xcpyrZtVwl4OIvWwLzT3AYV6C4zBsrc5V9KoVHOpV4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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