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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d92ee8a83f26f73cbed57175e83da54c3bdbcafe4bbda86736b9341cd8fc189' 
  AND token = 'p70sVuiHTQsOrv/zyGCrPfCPepksfvFhPOUAAPSfLJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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