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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fd099b41b18739720e257f61973c17e7dd79b6913e1c508037d6979a31cef44' 
  AND token = 'ko8qtPLmh3eaqv9RkRSrRb9cttCKbMcOkMm8ZUbSIyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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