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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90345c34448a4a04943761b6d6f66f8c6384bf78242ce9c9187574785a40125c' 
  AND token = 'Njbm7rdKtiBM8/rd2dNEC80LwD8fMRPH20oRjI11Lu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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