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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9a4a842c2f1dfe15ff9b83340b4ba2889d0ea2851e894d1eddba3342dd404c8' 
  AND token = 'gN7Xx0BHwDt4irP27vwMCFAqLULkUwJzfHFaKST8RFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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