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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '485a2441857fd592c0ad7c9cf26fad2c7b292e6821450e5e1c3a9971d2ec7be4' 
  AND token = '6HugnRGzALY05X8kLjcu/uV1Y7xVj57QNGUFkSnU6FU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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