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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bead8b242ffbdb64a85cb9dd8150bedfea0c7ae8ad82bd34e3cb1f24f287e38' 
  AND token = '9JdTr4ZtFnedgzO3kvqdTzfk7qTr+IKvr9I+fi5wPKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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