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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19ff09d288d549c3811cdb5628cefadfbddc52ef384fc26f00b5bbe080e474a3' 
  AND token = 'FmXL8x11ku7NsmN0xO+l8nv681e5y7Vt+OJF89ZQV94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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