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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af576f83af5ac3e2f7698b7ad7e4889324c6e64e72b55a46420c95fee77042ae' 
  AND token = '9jlQQv/+EaDvPor5aegoPoq5Z0E4Go4C2gOdLYYpiHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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