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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '898ddf6f51867f77e6a7011df7c8beb910a215bf5517fccf1f7e1c079e358d51' 
  AND token = 'I5JLPIYK40K8wATdgG9V8eRiIaSKhWsZSdBeP/0ZX44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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