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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ea31ff8026e895b7a178a6c5b4cea9a1d8620f2040c6798fade7fd5aae63af4' 
  AND token = 'k+66Aw/1e6oF1IWt6ljdox78Ro52Patde7mlrhPZ3J4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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