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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '624103f5be2b7fdac54efb2e3a220266c8d40944b8d32a3ea36fc4e6b12fb95c' 
  AND token = '9y2hp0HtA2rfGdBilULIe8ZdzMKydbaW9wpGtT+I17M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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