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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dddfbe5994ff5b6f3832c0d6eae582077ccecc9c29485a0ad55b3a32a6b45d8' 
  AND token = 'qe6T6oemR18dzFE0grYUhfNvyaVh8k3lmK3KU98bfbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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