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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd00f80783a1a810cbf79f1a86ff0695f4d3f70da6f3c26adeb8addb48f80a2e2' 
  AND token = 'aA4qrQvWqtWx02f0T73HF9oJ71qsqhg+LybQAFnKvd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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