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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52778dc4cba79a5f84001993076e8c210d625120daa7f68918ab4646b7b1be3b' 
  AND token = 'DDCmG5BWrHzwVkM2nQ9ehn0rny7w1U9AUYEaiUw/OM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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