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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b530474d4a4921b5a00a6de1441d29f57b7440891c65a4c78a46d31f2e19e39' 
  AND token = '6R14VF4mnKDn68VULaBtGLHrKlaxf1ktAsHXDSSpEpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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