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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e77fb6a633a98223bb18ff9bf820baadce8f00f67889dca96d0049ceac425575' 
  AND token = 'Gup8GTLalRaPibK4E+T5WCyzZGju0NUyvY+64s4pR4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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