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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30746e740b0ec148717180e3c0faef41799a81e847b607bf97cbfacfc90b85bb' 
  AND token = 'A0aFF0TDH+vkbhpoa3QDYYfxwOW5MBbRRNIo66FF2/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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