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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ef9a85284618b20eec55bcff0caf9f8cf128d34825f94403ff8dc6f61330c93' 
  AND token = 'DUfqID9OVKbSq/6TUsCENVDR0R91uMsWSS49hmsBw2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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