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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a4d6fa8de9b3a0d91dbfec7b5b83d591a8f8f12d9841a5db86866876b462e98' 
  AND token = 'tPMdkP2tMKV0BXaXd6lK0MlRAtDbe///e/iGTqVt40o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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