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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cddb4f26293ffbf1db13d919624ccfc61f7ab5ec02bbbb4b25e8f594b79b73e' 
  AND token = 'n8Z3Q+6ytbaKhqyKcD9KRlfP/lswALX/I3GxmJbNQW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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