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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f4cfec34d6badca197adf49fdfa5ca4bb72bb6cef74e95da1c1a9558b4fdb2e' 
  AND token = '6DF7d+USyxri9RAbs+htVb3hg14m092LROYrlF9K+jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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