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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36deabd35d50322de580f0d96c6375b9e05dd17003a19d56bee33ba3866e550f' 
  AND token = 'UnBpnlD5nw8D/gWwv3YguHFcHBekUe/DMtbQGy3RU3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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