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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02b2308c55d5a2ec23e7e6c7a49b2fb58acf95d22ae068224ce254e14dcfc0bc' 
  AND token = 'tW2iFa813JH3Uxgx5iiaGa0sdAhCON39OyeowvH4aA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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