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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3e5fa0158c0886feea4d37ebe0d7684d04059e0ee92a60d17e58ef79ee1ad03' 
  AND token = '59rGe5SuGm8aFpvR6GngFP1K3P1RJKnpQAPtjcSPnig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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